Fitted a new battery a few weeks ago on the basis that 'low battery please start engine' appeared quite regularly and this restricts certain functions such as FBH operation which I would like to operate properly during the coming months. Now the same old message has re-appeared. I would have thought low battery voltage would trigger this message, however as I previously suspected I think this message is based on duration of journeys rather than actual battery voltage. I've noticed from driving habits that a few short journeys in daylight, aircon switched off and minimal battery drain almost always trigger the message. Drive a longer journey with lights on, aircon etc. and it disappears. Thankfully, I had use for the old battery, but it seems to me the diagnostics work on duration of journeys rather than the actual sate of the battery ?

Do you have 2 batteries ?

Did you replace them both ?

Thanks Alistair, thought I only had one but you're correct There's another one clamped in behind the right hand side panel in the boot. Any idea if this is an AGM battery as well and what non JLR batteries might fit ? Can't see much info with it in situ. Looks a bit of a to change too

from my research Rob i have found that the aux battery in the rear right cubby is for the stop start system..

some early 4.4 without stop/start also had these aux batterys fitted and owners of these have had flat aux batterys with no battery warnings.....

did you reset the battery monitor when you fitted your new main battery? dont know whether this makes a difference to your battery warning but its is worth exploring.. ... - .- -.




Y. O. L. O.
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Thanks Stan, according to the manual for my car if it had stop start there'd be an 'Eco' button to enable / disable which is next to the ASL button on the centre console. Mine has the ASL button only so I assume no stop / start facility. Do you know what the aux battery powers in absence of this ? Also I didn't reset the battery monitor as I'd read somewhere that on the L405 you don't need to and it doesn't mention this in the manual either. It does have guidance on changing the main battery but doesn't mention the auxilliary battery at all....i'm a bit confused

i cant think why the early 4.4's had an aux battery...maybe the electronics were older and more power dependent than the newer 4.4's.

again from what i have found on the interweb, the early 3 litres had aux baterys for the stop/start whereas my 16my has a VQM [voltage quality monitor] with capacitor ...you never know what LR get up to in their R&D dept.



edit, re your problem, i've had a search and some of the massages have been solved by either telling the battery monitoring system that a new battery has been fitted or a dealer software update..
https://www.fullfatrr.com/forum/topic39744...ry+message ... - .- -.




Y. O. L. O.
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Yes, seems a bit odd, it's not a small battery either and is tucked in amongst a whole load of wiring / fuses and held in place with long screw down clamps. When I bought the new primary battery a short while ago the search on my reg number showed the need for an AGM battery with stop start capability I'm happy to change the aux battery if needs be but any info or spec seems thin on the ground. Care with the spanner required here too as it looks easy to short something out. Thanks for your research and hopefully a bit more info might come to light in due course.

Mine has two batteries and NO stop start system... The engine starts from the smaller battery in the side compartment. This is also an AGM battery...

I replaced both my batteries 18 months ago and i still get the low battery warning if i don't use the car is 5 or 6 days!

I can put the car on my CTek trickle charger and it can take 3 days solid for it to reach optimum level, then park it for 72 hrs and the low battery warning will chirp up again!

Our D4 is exactly the same! If not used for 10days or so it will bleep up Low Battery! this can take 3 or 4 days on the CTek to charge to optimal! Although this car has start stop system!
We drove to cornwall recently in the D4. Before we left the Low Battery warning was showing and it took until Falmouth for the stop start system to kick back in so, a good 3 to 4 hours of driving!!! Much more than i thought it would take...

I'm assuming you haven't registered them huh? This is likely the issue. When you install a new battery you need a capable diagnostic to register the new battery to the cars computer. If the old battery was going bad and faulted, those codes are stored and will keep resurfacing. The cars ECU needs to know you've fit a new battery, it'll benchmark it and clear the stored codes.

I see your point, and thanks for your input, but assume info in the owners handbook is deemed works capable by the humble owner and it doesn't mention anything other than physical requirements of changing the primary battery

Both batteries and the software update was done when I changed my batteries... Still get the same message back again 18 months later!
It’s probably because I don’t use/drive it enough! I don’t think it’s done 2k since I bought it!

roberlar wrote:

I see your point, and thanks for your input, but assume info in the owners handbook is deemed works capable by the humble owner and it doesn't mention anything other than physical requirements of changing the primary battery

this is from the WM Rob,








if you get the battery monitor reset it 'might' solve the message problem.. ... - .- -.




Y. O. L. O.
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Cam-Tech-Craig wrote:

Mine has two batteries and NO stop start system... The engine starts from the smaller battery in the side compartment. This is also an AGM battery...

I replaced both my batteries 18 months ago and i still get the low battery warning if i don't use the car is 5 or 6 days!

I can put the car on my CTek trickle charger and it can take 3 days solid for it to reach optimum level, then park it for 72 hrs and the low battery warning will chirp up again!

Our D4 is exactly the same! If not used for 10days or so it will bleep up Low Battery! this can take 3 or 4 days on the CTek to charge to optimal! Although this car has start stop system!
We drove to cornwall recently in the D4. Before we left the Low Battery warning was showing and it took until Falmouth for the stop start system to kick back in so, a good 3 to 4 hours of driving!!! Much more than i thought it would take...

That's confused me even more Craig as the engine turned over perfectly which I would assume means the secondary battery (which I haven't replaced) is in good order. I suppose the acid test (pardon the pun) arrives when the car won't start, which is probably the easiest diagnosis as to which battery needs replacing

stan wrote:

this is from the WM Rob,








if you get the battery monitor reset it 'might' solve the message problem..

Thanks Stan, saw this info a short while ago, done the left to right steering and will see how it goes